[Theory-seminars] Fwd: Theory Seminar, Monday Dec 11, 1:00pm, Room L102 - Daniel Pitonyak

[Andrea Signori]

Dear all,

this is the blue-jeans link to remotely attend the Theory Seminar: 
https://bluejeans.com/664937788
Regards,

     Alessandro, Andrea, Bipasha



Theory Center Seminar
Monday, Dec. 11, 2017
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L102

Daniel Pitonyak (PSU Berks)

*Transversely polarized collinear and TMD observables within the 
Collins-Soper-Sterman formalism*

We use the framework of the Collins-Soper-Sterman (CSS) formalism to 
discuss transversely polarized collinear and TMD observables, where we 
focus on the Sivers effect in SIDIS.  Using an improved version of the 
CSS framework, we are able to re-derive at leading order the well-known 
relation between the (TMD) Sivers function and the (collinear twist-3) 
Qiu-Sterman function.  We discuss the physical interpretation of this 
identity in terms of the average transverse momentum of unpolarized 
quarks in a transversely polarized spin-1/2 target.  We also show how it 
is collinear twist-3 functions that drive all collinear and TMD 
transverse-spin effects.

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